Definitions from Wiktionary ( )

▸ noun:  (music) A rapid alternation between an indicated note and the one above it as an ornament; in musical notation usually indicated with the letters tr written above the staff.
▸ noun:  (phonetics) A type of consonantal sound that is produced by vibrations of the tongue against the place of articulation: for example, Spanish ⟨rr⟩, /r/.
▸ noun:  A tremulous high-pitched vocal sound produced by cats.
▸ verb:  (intransitive) To create a trill sound; to utter trills or a trill; to play or sing in tremulous vibrations of sound; to have a trembling sound; to quaver.
▸ verb:  (transitive) To impart the quality of a trill to; to utter as, or with, a trill.
▸ verb:  (intransitive, obsolete) To trickle.
▸ verb:  (intransitive, obsolete) To twirl.
▸ adjective:  (slang, hip-hop culture) True, respected.

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